1317128737 has 8 divisors (see below), whose sum is σ = 1395232776. Its totient is φ = 1239094272.

The previous prime is 1317128717. The next prime is 1317128749. The reversal of 1317128737 is 7378217131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 112275216 + 1204853521 = 10596^2 + 34711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1317128737 - 2⁷ = 1317128609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1317128737.

It is not an unprimeable number, because it can be changed into a prime (1317128717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24493 + ... + 56869.

It is an arithmetic number, because the mean of its divisors is an integer number (174404097).

Almost surely, 2^1317128737 is an apocalyptic number.

1317128737 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1317128737 is a deficient number, since it is larger than the sum of its proper divisors (78104039).

1317128737 is a wasteful number, since it uses less digits than its factorization.

1317128737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34787.

The product of its digits is 49392, while the sum is 40.

The square root of 1317128737 is about 36292.2682812745. The cubic root of 1317128737 is about 1096.1653632888.

The spelling of 1317128737 in words is "one billion, three hundred seventeen million, one hundred twenty-eight thousand, seven hundred thirty-seven".